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Network Security Secure-Shell
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Re: Unique ssh/sftp requirement

from [Visolve Security Consulting Group] Network Security [Permanent Link]
Subject: Re: Unique ssh/sftp requirement
Date: Thu, 29 Jun 2006 10:28:45 +0530 
Hi,
       I have a unique ssh/sftp requirement.  I have two networks
separated by a firewall.  I would like to allow anyone on my "internal"
network to ssh to my "external" network but I would like to control who
is allowed to sftp/scp files from my internal network to my external
network.  How can I do this?  Is there a way to do this if my firewall
doesn't support controlling such an activity?  Will setting up some kind
of internal proxy/port forwarding server do the trick?

The version that I am using is:
OpenSSH_4.1, OpenSSL 0.9.7e 25 Oct 2004
HP-UX Secure Shell - A.04.00.000


Hello Jim,

The sftp/scp commands internally make use of ssh for remote connection. So 
you can't control sftp/scp providing access only to ssh. For scp, the remote 
machine (sshd) invoke scp process and for sftp it invokes sftp-server 
subsystem. So you can completely disable sftp/scp by removing them in the 
remote system. But that happens only after Authenticating the user :(

regards,
Visolve Security Consulting Group.
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